fix: Use stable media type in Starring API

[alexandear]

Starring API is stable, according to the documentation https://docs.github.com/en/rest/activity/starring?apiVersion=2022-11-28

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.32%. Comparing base (8878e69) to head (85dc301).
Report is 1 commits behind head on master.

Additional details and impacted files

@@ Coverage Diff @@## master #3590 +/- ##
=======================================
Coverage 91.32% 91.32% =======================================
Files 184 184 Lines 16143 16143 =======================================
Hits 14742 14742 Misses 1227 1227 Partials 174 174 

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[gmlewis]

Thank you, @alexandear!
LGTM.
Merging.